PLANTS OF SOUTHERN NEW JERSEY. 449 



bb'b. Leaves ternately compound, flowers red and yellow pendant, with 

 long spurs. Aquilegia canadensis, p. 452 



aa. Fruit consisting of berries, leaves ternately compound, flowers white, in 

 an erect raceme. 



b. Berries white, pedicels red. Actcra alba, p. 451 



bb. Berries red. Aetata rubra, p. 451 



aaa. Fruit consisting of cluster of achenes. 



b. Stem-leaves forming an involucre below the calyx : as the sepals are 

 blue or white, they could easily be taken for petals (which are lack- 

 ing) and the green bracts for sepals. 

 c. Involucre remote from the white flower (tinged with pink or 

 green externally). 

 d. Achenes densely wooly, flowers white, plant 6-10 dm. high. 



A. virginiana, p. 452 

 dd. Achenes pubescent or nearly glabrous. 



e. Plant 3-6 dm. high, involucral leaves sessile. 



A. canadensis, p. 452 

 ee. Plant 1-2 dm. high, involucral leaves, lobed, petioled. 



A. quinqiiefolia, p. 453 

 cc. Involucre of three simple leaves close to the flower. 



Hepatica hepatica, p. 453 

 ccc. Involucre of three compound sessile leaves. 



Syndesmon thalictroides, p. 454 

 bb. No involucral leaves. 



c. Leaves opposite, plant a climbing vine, flowers white, sepals petal- 

 like, petals wanting. Clematis virginiana, p. 454 

 cc. Leaves alternate or basal, not climbing vines. 

 d. Petals present. 



e. Achenes compressed, flowers yellow. 



f. Aquatic plant with finely divided floating leaves. 



R. delphinifolius, p. 454 

 ff. Plants of swamps or muddy shores, leaves entire 

 or denticulate. 

 g. Plant low, 1.5-3 dm. high, petals barely exceed- 

 ing the sepals, stamens i-io. R. pusillus, p. 455 

 gg. Plant taller, 3-10 dm. high, petals longer than 

 sepals, stamens numerous. 



R. obtusiusculus, p. 455 

 fff. Leaves, some or all, lobed or divided, terrestrial 

 species or growing upright in shallow water, 

 g. Some of the basal leaves merely crenate. 



R. abortivus, p. 455 

 gg. Leaves all lobed or divided. 



h. Flowers small, pale, less than 12 mm. broad, 

 petals rarely exceeding the sepals. 

 i. Plant glabrous. R. sceleratus, p. 456 



a. Plants hirsute. 



/. Head of fruit globose, beak of achene 

 2Q MUS hooked. R. recurvatus, p. 456 



